Hi all! finally registered for the HAMB, have lurked and fixed most of the issues I encounter just through searching, however totally stumped on this one! Helping out a good friend with his SBC powered 37 ford and just cannot seem to get the dual quads to run right. Using a wideband O2 gauge and no matter what we try, it goes pig rich at WOT and blubbers until roughly 3k RPM and hits the desired 11.5-12 AFR. It just flatlines the gauge at 10 afr (suspect its lower than that but that's as low as the gauge reads). I will try to list as many details as possible in hopes that some one spots the smoking gun issue. I have also called edelbrock tech line, which was essentially zero help. Also tried a few reputable carb shops in hopes of some direction and most are not interested in conversing about "edeljunk" carbs heh. Anyway set up is as follows: GM performance aluminum headed 350, alleged 383 HP (gm numbers) Edelbrock Dual 500 AVS carbs on top of the eddy RPM air gap manifold Timing is an MSD billet distributor at 18 initial, all in around 3200 RPM- Vac advance attached to manifold vac. Throttle linkage is progressive but have tried 1:1 with no improvement Turbo 350 trans Was told its a 3.50 rear gear but feels a little taller by the seat of the pants, might just be the pig richness however. Operating in socal at about 10' above sea level. Cruise AFR, idle and part throttle are all pretty much on the money, just when you go WOT it refuses to burn out, and loads up big time. We have gone a few steps leaner on front and rear metering rods as well as primary and secondary jets. also tried softer springs to hold the rods in the leaner position for a little longer. Tried adjusting the spring on the secondary air doors stiffer to open later and vice versa. Tried the different ACC pump holes including disconnecting the front entirely to see if it makes any change. NONE MADE A SIGNIFICANT DENT IN THE ULTRA FAT AFR. The frustration is mounting and I am fresh out of ideas. Is it just the nature of the beast? Please help! Thanks!